Companion cells transport of photosynthetic products from producing cells in mature leaves to the sieve elements in the minor veins of the leaf. There are at least three different types of companion cells in the minor veins of mature, exporting leaves, All three cell types have dense cytoplasm and abundant mitochondria;

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#Question id: 3682

#SCPH05 I Biotechnology

A mutated strain of E. coli replicates DNA normally at 25°C, but replication stops immediately when the temperature is raised to 37°C. Which protein is likely to be non-functional at the higher temperature?

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#Question id: 3718

#SCPH28 | Zoology

Enzymes that remain bound to their nascent chains through many polymerization steps are said to be ________.

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#Question id: 8864

#SCPH06 I Botany

Corals are most closely related to which group?

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#Question id: 19891

#SCPH01 Biochemistry

Which one of the following sensors uses light?

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#Question id: 607

#SCPH05 I Biotechnology

In E. coli ________ is an activator and ________ is a negative allosteric modulator of the enzyme phosphofructokinase-1.